{"id":"10c5c085-2127-4751-aa6c-1ffeff68e4ad","shortId":"8Bnqmm","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/messages/168` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing model.\n\nThis particular endpoint (`/api/v1/messages/168`) does not have detailed documentation beyond its \"Premium API Access\" label. There is no OpenAPI schema, no example request/response payloads, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional content. The exact functionality behind this specific messages endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API access","Base network API","lowpaymentfee","premium API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality of /api/v1/messages/168 is undocumented — 'Premium API Access' is the only description","Crawled /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')","No example request or response payloads are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/168","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/messages/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation explaining what the /api/v1/messages/168 endpoint actually does. The crawled pages beyond the homepage returned only wallet-connect prompts with no useful 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'/request':13,28,166 '0.02':12,27,86,165 '000':81 '0x8335':71 '20':80 '2913':72 '6':91 'Base network API' 'USDC API access' 'accept':62 'access':7,22,60,182 'across':123 'addit':209 'advertis':121 'ai':133 'amount':78 'analysi':137 'analyt':127 'api':6,21,40,59,94,181 'attach':105 'avail':222 'base':9,24,49,74,82 'base-network' 'behind':214 'beyond':178 'broader':118 'call':4,19 'caller':103 'categori':125 'classif':140 'collect':34 'commit':100 'connect':205 'content':210 'contract':70 'convers':157 'crawl':195 'crypto-paid API' 'data':126,130 'decim':92 'detail':176 'doc':196 'document':177 'embed':141 'endpoint':41,53,122,161,171,218 'equal':85 'estim':151 'exact':212 'exampl':190 'exchang':146 'export':131 'feed':145 'financ':142 'four':124 'function':213 'gas':150 'gate':42 'generat':158 'geocod':155 'header':110 'host':32 'infrastructur':153 'insight':132 'json-response' 'key':95 'label':57,183 'learn':135 'limit':97 'list':160 'lowpaymentfee' 'lowpaymentfee.com':31,119 'machin':134 'materi':223 'maximum':77 'messag':217 'metric':128 'micropayment API' 'model':168 'network':50 'no-api-key' 'openapi':187 'page':199 'particular':170 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':192 'payment':65,109,115 'per':3,18,38,87 'platform':120 'post':63 'post-endpoint' 'premium':5,20,58,180 'premium API' 'price':144,167,198 'prompt':206 'proof':116 'protocol':46 'quot':149 'rate':96,147 'report':129 'request':39,64,88 'request/response':191 'requir':102 'return':200 'schema':188 'sentiment':136 'settl':67 'share':162 'simpli':104 'specif':52,216 'summar':139 'text':138 'token':148 'unclear':220 'unit':83 'upfront':99 'usdc':15,30,69,89 'usdc-settlement' 'use':90 'util':154 'valid':113,156 'via':10,25 'wallet':204 'wallet-connect':203 'web3':143 'x':108 'x-payment':107 'x402':11,26,45,114 'x402 API' 'x402-payment'","prices":[{"id":"f5ecd4ec-ead8-4c88-aa52-1fa3e24d5ce8","listingId":"10c5c085-2127-4751-aa6c-1ffeff68e4ad","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/messages/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.189Z"}],"sources":[{"listingId":"10c5c085-2127-4751-aa6c-1ffeff68e4ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.189Z","lastSeenAt":"2026-04-22T02:32:06.447Z"}],"details":{"listingId":"10c5c085-2127-4751-aa6c-1ffeff68e4ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/168 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/168"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/168"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing an API key or subscription","Agent-driven workflows that pay per call using on-chain USDC on Base","Programmatic access to gated content or services with instant micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.426Z"},"updatedAt":"2026-04-22T02:32:06.447Z"}}